APA (7 ম সংস্করণ) উদ্ধৃতি

Reichheld, F. F. (2006). The ultimate question: Driving good profits and true growth (NA.). Harvard Business School Press.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

Reichheld, Frederick F. The Ultimate Question: Driving Good Profits and True Growth. NA. USA: Harvard Business School Press, 2006.

M.L.A (9 ম সংস্করণ) উদ্ধৃতি

Reichheld, Frederick F. The Ultimate Question: Driving Good Profits and True Growth. NA. Harvard Business School Press, 2006.